Examlex
The protective outermost layer of the esophagus is the ________.
Sleep-wake Cycles
The natural, circadian rhythm that regulates when we are awake and when we sleep, typically repeating every 24 hours.
Light Perception
The ability to see light and differentiate between its intensity and direction, a fundamental aspect of vision.
Circadian Rhythms
Biological processes that occur on a roughly 24-hour cycle, influencing sleep, wakefulness, and various bodily functions.
Pineal Gland
A small endocrine gland in the brain that produces melatonin, a hormone that regulates sleep patterns.
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